Transcript for Ted Cruz, John Kasich Band Together to Stop Donald Trump

To you to the big day in the race for the white house. Five states up for grabs. Pennsylvania, the biggest prize, the big news in the republican race, Ted Cruz and John kasich banding together to try and stop Donald Trump. But can it work? ABC's Tom llamas is at a polling place in Pennsylvania. Good morning, Tom. Reporter: Robin, good morning to you. The voting now under way here in Pennsylvania. And a first for the trump complain. Trump handing out these delegate slate, the trump delegates that will support him at the convention. So now the trump campaign wants to make sure they not only win the voting here but also win the support they need at the convention. Who's going to vote for trump? Reporter: This morning, Donald Trump eyeing a clean sweep of five states voting today. But still bitter about the cruz/kasich alliance. Lyin' Ted announced that he can't win by himself. He cannot do it. You know, he's a joker. Reporter: The front-runner going after his republican rivals after senator Ted Cruz and governor John kasich announced they'd stay out of each other's way in certain primaries. To beat the billionaire. Trump calling it collusion, upset over that and apparently kasich's eating habits. This guy takes the pancake and he's shoving it in his mouth. It's disgusting. Do you want that for your president? I don't think so. Reporter: Even claiming his 10-year-old son was sickened by the Ohio governor. He said, daddy, who is that guy on television? That's disgusting. Reporter: Kasich firing back. I mean the man is full of insults. He's been insulting me all day. I kind of chuckle. I think it's humorous. The trump people are very desperate, very fearful. Trump not stopping there. Also sounding off on appearances and Hillary Clinton. Do I look like a president? How handsome am I, right? How handsome? Somebody said he really does look good but, you know, I don't know if he's presidential -- and I'm looking at the stain. People. My competitors. Does Hillary look presidential to you? Reporter: But as trump talked looks and table manners, senator Cruz talks strategy. This is not your father's gop. Reporter: Focusing now on Indiana which votes next week. Cruz predicting his campaign picks up steam in upcoming western primaries. And the final state to vote will be the state of California. 172 delegates. The big enchilada. I believe we'll do very well in California. Reporter: Now this morning, apparently there is peace in one of the biggest fights this campaign season, Donald Trump agreeing to sit down with megyn Kelly tore a special interview that airs in mid-may. The two's first interview since the famous exchange in the first presidential debate. Thanks very much.

This transcript has been automatically generated and may not be 100% accurate.

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